TDA7854

Overview

The TDA7854 is a Class AB MOSFET quad bridge audio power amplifier designed for high-power car radio applications. It utilizes Multipower BCD technology and features a fully complementary P-Channel/N-Channel output structure enabling rail-to-rail voltage swing. The device delivers up to 4 x 47 W into 4 Ω loads and 4 x 80 W into 2 Ω loads at maximum ratings. Electrical specifications include an internally fixed gain of 26 dB, a supply voltage range of 8 V to 18 V, and operation within a junction temperature range of -55 °C to 150 °C.

Feature Summary

• MOSFET output power stage with excellent low impedance driving capability
• Integrated protections including short circuit, thermal limiting, load dump, and reversed battery protection
• Low external component count due to internally fixed gain and absence of bootstrap capacitors
• Automute function triggered by minimum supply voltage detection

Applications

• High-power automotive radio systems
• Car audio amplification requiring robust low-impedance speaker driving

Procurement Notes

Verify the obsolete status of this component before initiating any design-in process. Confirm availability through authorized distributors or secondary market suppliers, as standard manufacturing channels may no longer support active production. Ensure that replacement components are evaluated for mechanical compatibility and electrical equivalence prior to procurement.

Selection Notes

Select this component for designs requiring high output power in a compact form factor without complex external compensation networks. The integrated protections simplify system reliability requirements. Evaluate thermal management needs carefully, as the device dissipates significant power under full-volume conditions. Verify that the application environment supports the specified operating temperature ranges.

Part Context

This part belongs to STMicroelectronics' TDA7850 series of automotive audio amplifiers. It shares architectural similarities with other members like the TDA7850 but offers specific power outputs tailored for demanding car radio environments. The series is characterized by its Flexiwatt 25 packaging and comprehensive protection suite suitable for harsh automotive electrical conditions.

Replacement Considerations

TDA7850H